A first-time customer can't taste your latte before paying for it. So how do they pick your door over the one across the street? They read signals, and they remember.
Learning objectives. After this week you can (1) explain asymmetric information and adverse selection; (2) tell a credible signal from cheap talk; and (3) explain why reputation is an asset, and what moral hazard does to it.
Remember this: a signal works because it is costly to fake.
1) When buyers can't see quality
Coffee is an experience good: you learn its quality only after you buy. You know your quality; a new customer doesn't. That is asymmetric information. In the extreme (the "lemons" problem), buyers who can't tell good from bad pay only an average price, the best sellers leave, and quality falls: adverse selection.
2) Signals and screens
A signal is a costly action that shows quality because a low-quality seller couldn't afford to copy it. "Best Coffee in Town!" on a banner is cheap talk: anyone can say it for free. Your signals cost real money: specialty beans raise the cost of every cup, and a renovation costs $2,500 once and lifts your ambiance for good, visible before the first sip. Screening runs the other way: the side without the information sets up a sorting device, like a student-ID discount.
Daily cost of a quality signal = extra cost per cup × cups
If switching to specialty raises your MC latte line from $1.20 to $1.40, at 200 lattes a day the signal costs 200 × $0.20 = $40 a day. The beans change the product itself; an ad only changes the claim.
3) Reputation: fast to lose, slow to rebuild
Reputation is a stock your shop carries from day to day. Lines where customers walk away dent it, and so do events like a bad review or a rough inspection. Profitable days rebuild it slowly. That makes it an asset: a shop with a good name has more to lose from cutting corners, which is why customers trust it. Your Regulars count is the part you can see: customers who learned your quality firsthand, keep coming back, and pay less attention to price.
4) Moral hazard and advertising
Moral hazard is hidden action after trust is won: quietly switching to cheaper beans or skimping on maintenance while your reputation absorbs the damage. It pays for a day and costs later. Advertising helps people find you, but your form warns that marketing has diminishing returns, and an ad brings a customer back only if the coffee is worth it.
Quick self-check
(a) Why does a $2,500 renovation say more about quality than a free banner? (b) Your MC latte rises $0.25 when you switch beans, and you sell 160 lattes a day. What does the signal cost? (Answers: it is costly to fake, so only a shop expecting repeat business pays for it; 160 × $0.25 = $40 a day.)
Common mistakes
- Signaling with words. Only costly actions carry information.
- Letting the line do the talking. Walk-aways turn a capacity problem into a trust problem.
- Treating trust as permanent. Cutting corners spends it.
This week in the arena
Write down your Regulars count on your first and last Daily Report this week, and the customers who walked away on your busiest day. Is your base of returning customers growing or shrinking? Then name the signal your shop is sending (beans, renovation, or neither) and what it costs you a day.